“Two roles, both chem-crucial, aligned here, /
In artistic combo’s reminder; /
Blend a bright-vivid tint /
With an adhesive’s stint: /
A paint is a pigment plus binder.”
The 10 April 2026 Bluesky limerick summarizes one of the early themes I teach in one of my general education courses.
“Two roles, both chem-crucial, aligned here, /
In artistic combo’s reminder…”
I enjoy teaching my Chemistry in Art course but understand that (as part of general education) it is “the science course” for many wary students. One of our early-semester discussions thus addresses paint as an accessible, introductory example.
“Blend a bright-vivid tint /
With an adhesive’s stint: /
A paint is a pigment plus binder.”
Thinking through what allows a paint to function, we can see that it would require the mixture of at least two compounds. We need both the “bright-vivid tint” of a pigment, providing the color, and the “adhesive’s stint” of a binder, providing the ability to adhere to a surface.
The identity of the binder is what defines the paint. Oil paint uses linseed oil or another drying oil; tempera paint uses egg yolk, most commonly. Encaustic uses wax, and watercolor uses gum arabic. Each binder dries differently, leading to different appearances of the paint.
Typically, in terms of paint composition, a pigment is an ionic compound (combining a metal element and a non-metal element); a binder is a molecular compound (combining multiple non-metal elements). I should acknowledge that these are technically heuristics but work most of the time. As an example, Claude Monet’s Water Lilies employs zinc yellow and cobalt blue, among other pigments, with an oil binder. This website is extraordinary and well worth some exploration, for anyone interested in this topic!
In my experience, the paint discussion provides a reasonable step into chemistry jargon, starting from a familiar example. (It also opens the door to considering how complex the familiar actually can be, once we start to observe with intention.)
